D.B.
I think it must be frustrating for the hubby and the architect to downsize a room they don't use all the time and just assume that you, the chief laundry-doer, will manage. You don't know how you feel about it, but they're moving ahead with plans?
I think keeping a sink in the laundry area is a good start. You mention a drying rack, and I think it might help to look into a fold-up or recessed laundry rack that folds out as needed as opposed to a stand-on-the-floor rack. Perhaps if it folded out over the sink, that would work well for drip-drying. That depends, of course, on how much you have to hang up on a daily basis. There are also those retractable clotheslines like they have in hotel rooms, or a closet rod (which I have). My laundry is in a slight closet - there's no sink, but there is room for a tall hamper between the wall and the open dryer door, along with 2 shelves and a closet rod. There is room for us to stand in there while loading the washer too. There's not a lot of folding space except the top of the washer and dryer though. I don't have a drying rack although I do hang a few things from hangers (like lingerie which I wash on the gentle cycle but don't put in the dryer). We don't have a pocket door due to the location in a back hall and near the back door, but if I wee redesigning the space the way you are, I would look at a pocket door Another factor would be whether you have hampers in any of the bedrooms or whether all dirty laundry gets carried to the laundry room on a daily basis - if the latter, you need a lot more room than a closet. My husband does most of the laundry since he is a runner and has a lot of sweaty stuff. We rarely wash blankets because they are between a sheet and a bedspread so don't get dirty, dusty or sweaty at all. If I were doing a lot of linens and blankets for a family though, I would think more room would be important.
Still, having a bigger kitchen and better flow for everyone would be a real plus.